Question

callingmethod(){
File f=new File();  
//...
String s= new String();
//...

method( f + s);    // here is problem (most put f+s in object to send it to method)
}

cant change method args

method(Object o){
//...
//how to split it to file and String here 
}

for any thing not clear ask plz

Answer 1

You can e.g. put it in an array:

method (new Object[] {f, s});

void method (Object o) {
    final Object[] arr = (Object[]) o;
    File f = (File) arr[0];
    String s = (String) arr[1];
}